third_party/lcms/0023-upstream-integer-overflow-MPEmatrix_Read.patch

diff --git a/third_party/lcms/src/cmscgats.c b/third_party/lcms/src/cmscgats.c
index 5720c66a7..cce4cedba 100644
--- a/third_party/lcms/src/cmscgats.c
+++ b/third_party/lcms/src/cmscgats.c
@@ -150,23 +150,24 @@ typedef struct {
         SUBALLOCATOR   Allocator;             // String suballocator -- just to keep it fast
 
         // Parser state machine
-        SYMBOL         sy;                    // Current symbol
-        int            ch;                    // Current character
+        SYMBOL             sy;                // Current symbol
+        int                ch;                // Current character
+
+        cmsInt32Number     inum;              // integer value
+        cmsFloat64Number   dnum;              // real value
 
-        int            inum;                  // integer value
-        cmsFloat64Number         dnum;                  // real value
         char           id[MAXID];             // identifier
         char           str[MAXSTR];           // string
 
         // Allowed keywords & datasets. They have visibility on whole stream
-        KEYVALUE*     ValidKeywords;
-        KEYVALUE*     ValidSampleID;
+        KEYVALUE*      ValidKeywords;
+        KEYVALUE*      ValidSampleID;
 
         char*          Source;                // Points to loc. being parsed
-        int            lineno;                // line counter for error reporting
+        cmsInt32Number lineno;                // line counter for error reporting
 
         FILECTX*       FileStack[MAXINCLUDE]; // Stack of files being parsed
-        int            IncludeSP;             // Include Stack Pointer
+        cmsInt32Number IncludeSP;             // Include Stack Pointer
 
         char*          MemoryBlock;           // The stream if holded in memory
 
@@ -568,8 +569,8 @@ void ReadReal(cmsIT8* it8, int inum)
     // Exponent, example 34.00E+20
     if (toupper(it8->ch) == 'E') {
 
-        int e;
-        int sgn;
+        cmsInt32Number e;
+        cmsInt32Number sgn;
 
         NextCh(it8); sgn = 1;
 
@@ -587,7 +588,7 @@ void ReadReal(cmsIT8* it8, int inum)
             e = 0;
             while (isdigit(it8->ch)) {
 
-                if ((cmsFloat64Number) e * 10L < INT_MAX)
+                if ((cmsFloat64Number) e * 10L < (cmsFloat64Number) +2147483647.0)
                     e = e * 10 + (it8->ch - '0');
 
                 NextCh(it8);
@@ -777,7 +778,7 @@ void InSymbol(cmsIT8* it8)
 
                 while (isdigit(it8->ch)) {
 
-                    if ((long) it8->inum * 10L > (long) INT_MAX) {
+                    if ((cmsFloat64Number) it8->inum * 10L > (cmsFloat64Number) +2147483647.0) {
                         ReadReal(it8, it8->inum);
                         it8->sy = SDNUM;
                         it8->dnum *= sign;
diff --git a/third_party/lcms/src/cmstypes.c b/third_party/lcms/src/cmstypes.c
index 0256e247b..75f1fae32 100644
--- a/third_party/lcms/src/cmstypes.c
+++ b/third_party/lcms/src/cmstypes.c
@@ -4199,9 +4199,13 @@ void *Type_MPEmatrix_Read(struct _cms_typehandler_struct* self, cmsIOHANDLER* io
     if (!_cmsReadUInt16Number(io, &OutputChans)) return NULL;
 
 
+    // Input and output chans may be ANY (up to 0xffff), 
+    // but we choose to limit to 16 channels for now
+    if (InputChans >= cmsMAXCHANNELS) return NULL;
+    if (OutputChans >= cmsMAXCHANNELS) return NULL;
+
     nElems = InputChans * OutputChans;
 
-    // Input and output chans may be ANY (up to 0xffff)
     Matrix = (cmsFloat64Number*) _cmsCalloc(self ->ContextID, nElems, sizeof(cmsFloat64Number));
     if (Matrix == NULL) return NULL;